I've upgraded a site to Version2.3.9.8 MSSQL, (Operating SystemMicrosoft Windows NT 6.0.6002 Service Pack 2

ASP.NET Infov4.0.30319 Running in Full Trust) and we have noticed that CKEditor is removing attributes from HTML Content.

For example, if we switch to "source" view, and add styling to a div like this:

<div  style="background-color: red; float:right;">some stuff</div> 

then save the edits, the styling shows fine in the browser. But when we click "edit" and go back to the "source" the attribute has gone.

I wondered if this was CKEditor being fierce about not using inline styling, but the same happens if we add  <div class="modulecontent">. It does not strip attributes from all elements - this survives for example: <img alt="Mike" src="/Data/Sites/1/media/about/Mike.jpg" style="height:187px; width:187px" />

I've tested on demo.mojoportal.com and cannot replicate this. 

With a little more investigation with Fiddler, I can see that the attribute is still there when we first click "edit", for example I can see this in the response from  /HtmlEdit.aspx?mid=...

&lt;div  style=&quot;background-color: red; float:right;&quot;&gt;some stuff&lt;/div&gt; 

But when we click on "Source" it is stripped and this turns into

<div>some stuff</div>

We are using a custom config file for CKEditor, but the config is similar to the default one except for changing the language to en-GB and switching off scayt.

Any ideas?

Thanks Joe, that fixed it.